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3U4 Vacuum Tube New and Used

$7.50
3U4 Vacuum Tube New and Used
3U4 Vacuum Tube New and Used

Home / Shop

3U4 Vacuum Tube New and Used

$7.50
Model Number: 3U4NEW
3U4 power amplifier pentode vacuum tube for battery portable radios, featuring a 1.4V/2.8V filament and 7-pin miniature base.
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Categories: Vacuum Tubes and Accessories
Manufacturer: Multiple Manufacturers
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  • Description
  • Specifications

The 3U4 is a 7-pin miniature power amplifier pentode designed for audio output stages in battery-operated portable radio receivers. Featuring a center-tapped direct-heated filament, it operates flexibly on a 1.4V filament line (parallel connection) or a 2.8V line (series connection). It provides efficient audio output power with low battery drain. Available in new old stock (NOS) and tested used conditions.

  • Type: Power Amplifier Pentode (Audio Output)

  • Base: 7-Pin Miniature (EIA 7BK layout)

  • Filament Voltage: 1.4V (Parallel) / 2.8V (Series)

  • Filament Current: 0.1A (Parallel) / 0.05A (Series)

  • Max Plate Voltage: 90V

  • Max Screen Grid Voltage: 90V

  • Max Plate Dissipation: 2.0W

  • Power Output: 270 mW

  • Mutual Conductance: 1,900 microsiemens (1.9 mA/V)

  • Equivalents: 3U4, DL92, VT-288